Wood lamp examination

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A Wood lamp examination is a test that uses ultraviolet (UV) light to look at the skin closely.

How the Test Is Performed

You sit in a dark room for this test. The test is usually done in a skin doctor's (dermatologist) office. The doctor will turn on the Wood lamp and hold it 4 to 5 inches (10 to 12.5 centimeters) from the skin to look for color changes.

How to Prepare for the Test

You do not need to take any special steps before this test. Follow your doctor's instructions about not putting creams or medicines on the area of the skin before the test.

How the Test will Feel

You will have no discomfort during this test.

Why the Test Is Performed

This test is done to look for skin problems including:

Bacterial infections

Fungal infections

Porphyria (an inherited disorder that causes rashes, blistering, and scarring of the skin)

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